MFS® Investment Management

500 Boylston Street, Boston, MA  02116-3741

617.954.5000    mfs.com

November 1, 2010

VIA EDGAR

United States Securities and Exchange Commission

100 F Street, N.E.

Washington, DC  20549

Re: MFS® Institutional Trust (the “Trust”) (File Nos. 33-37615 and 811-6174) on behalf of MFS® Institutional International Equity Fund and MFS® Institutional Large Cap Value Fund

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter on behalf of the Trust as certification that the Prospectuses and Statement of Additional Information for the Trust do not differ from those contained in Post-Effective Amendment No. 31 (the “Amendment”) to the Trust’s Registration Statement on Form N-1A.  The Amendment was filed electronically on October 27, 2010.

Please call the undersigned at (617) 954-5822 or Lisa Foley at (617) 954-6634 with any questions you may have.

Very truly yours,

CHRISTOPHER R. BOHANE

Christopher R. Bohane

Vice President & Senior Counsel

CRB/bjn